The pharmacokinetics and therapeutic efficacy of fleroxacin and pefloxacin in a rat abscess model

Eugene Leibovitz, Gershon Keren, Moshe Shabtai, Asher Barzilai, Ethan Rubinstein

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The penetration, pharmacokinetics and therapeutic efficacy of fleroxacin and pefloxacin were investigated in a rat abscess model. Abscesses were induced by implanting a dialysis tube unit contaminated with Serratia marcescens in the subcutaneous tissue. Simultaneous serum, interstitial fluid (IF) and abscess fluid concentrations of the investigated antibiotics were measured 24 and 96 h after implantation. The concentrations were determined at various time intervals after the last intramuscular administration of each drug (20 mg/kg).Peak fleroxacin and pefloxacin concentrations in the serum of the infected animals were 14·6±4·7mg/l and 13±2·9mg/l respectively, peak fleroxacin and pefloxacin abscess fluid concentrations after 24 h were 12·3±2·5mg/l and 8·9±2·2 mg/l, respectively (85% and 68% of peak serum concentrations). Abscess fluid concentrations at 96 h were: fleroxacin 4·7±2·6 mg/l and pefloxacin 4·5±1·7 mg/l. Both antimicrobials persisted significantly longer in the abscess fluid than in serum.Both drugs failed to sterilize the abscesses following a single administration; however after four consecutive administrations all abscesses became sterile.We conclude that fleroxacin and pefloxacin may be suitable for the therapy of closed space infections caused by susceptible micro-organisms.

Original languageEnglish
Pages (from-to)375-385
Number of pages11
JournalJournal of Antimicrobial Chemotherapy
Volume24
Issue number3
DOIs
StatePublished - 1 Sep 1989
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Microbiology (medical)
  • Infectious Diseases
  • Pharmacology (medical)

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